I think you should consider a different design, assuming I understand your problem. The real problem is that when you create a product offer you're only allowing the user to select one product. Why don't you make a many to many join table so that one product offer has many offer products and one product master has what many offer products. So that way you could have multiple products on the same offer.
This is what the relationship would look like.
Offer < Offer Products > Product Master
------------------------------
Mark Shnier (YQC)
mark.shnier@gmail.com
------------------------------
